Window sill



FIG. 1 is a perspective view looking down on the window sill;

FIG. 2 is an end view of the window sill;

FIG. 3 is a top view of the window sill;

FIG. 4 is a rear view of the window sill;

FIG. 5 is a front view of the window sill; and,

FIG. 6 is a bottom view of the window sill.

The window sill is broken in the center to indicate indeterminate length. 

The ornamental design for a window sill, as shown and described. 